kevin reeder: how are you feeling at this point? what were you... what were you feeling at that time? >> collins: anger. i'm scared.'m feeling pain-- my leg, my back, my arm, my whole body. >> reeder: okay, let's go from the beginning. got to keep doing this. >> collins: the next thing i know, i hear a loud boom... >> pelley: they call it prolonged exposure because collins will relive the story of the attack five times a session. there's a tape running, and he'll listen to his memory throughout the day to break its power. tell me about prolonged exposure therapy. >> reeder: sure. they've done everything they can to push these memories away. in the process, they haven't gained a full realization of the impact and the meaning that these stories have on their lives. i like to use the term, "we're staring the dragon in the eye." >> pelley: where do these therapies come from? >> reeder: a lot of these therapies came about with survivors of physical or sexual abuse, those types of traumas. >> pelley: what are the similarities? >> reeder: the symptoms. the symptoms-- the avoidance, the isolation, the hyper- vigilance, ext